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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_13) on Tue Jun 05 11:36:41 GMT-05:00 2007 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>AbstractCanvas (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.display.canvas.AbstractCanvas class"><META NAME="keywords" CONTENT="FINEST_RESOLUTION"><META NAME="keywords" CONTENT="REQUIRED_RESOLUTION"><META NAME="keywords" CONTENT="PREFETCH"><META NAME="keywords" CONTENT="hints"><META NAME="keywords" CONTENT="getFactory()"><META NAME="keywords" CONTENT="getUID()"><META NAME="keywords" CONTENT="getTitle()"><META NAME="keywords" CONTENT="setTitle()"><META NAME="keywords" CONTENT="add()"><META NAME="keywords" CONTENT="addAsEditable()"><META NAME="keywords" CONTENT="remove()"><META NAME="keywords" CONTENT="removeAll()"><META NAME="keywords" CONTENT="getGraphics()"><META NAME="keywords" CONTENT="graphicPropertyChanged()"><META NAME="keywords" CONTENT="addEventManager()"><META NAME="keywords" CONTENT="findEventManager()"><META NAME="keywords" CONTENT="disposeEventManagers()"><META NAME="keywords" CONTENT="addCanvasListener()"><META NAME="keywords" CONTENT="removeCanvasListener()"><META NAME="keywords" CONTENT="enableCanvasHandler()"><META NAME="keywords" CONTENT="removeCanvasHandler()"><META NAME="keywords" CONTENT="getActiveCanvasHandler()"><META NAME="keywords" CONTENT="getDisplayCoordinateReferenceSystem()"><META NAME="keywords" CONTENT="getObjectiveCoordinateReferenceSystem()"><META NAME="keywords" CONTENT="setObjectiveCoordinateReferenceSystem()"><META NAME="keywords" CONTENT="getObjectiveCRS()"><META NAME="keywords" CONTENT="setObjectiveCRS()"><META NAME="keywords" CONTENT="getDisplayCRS()"><META NAME="keywords" CONTENT="getDeviceCRS()"><META NAME="keywords" CONTENT="setObjectiveToDisplayTransform()"><META NAME="keywords" CONTENT="getRenderingHint()"><META NAME="keywords" CONTENT="setRenderingHint()"><META NAME="keywords" CONTENT="clearCache()"><META NAME="keywords" CONTENT="dispose()"><META NAME="keywords" CONTENT="toString()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="AbstractCanvas (Geotools 2.3.x 2.3.2 API)";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/AbstractCanvas.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> PREV CLASS <A HREF="../../../../org/geotools/display/canvas/AbstractGraphic.html" title="class in org.geotools.display.canvas"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="AbstractCanvas.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.geotools.display.canvas</FONT><BR>Class AbstractCanvas</H2><PRE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../org/geotools/display/canvas/DisplayObject.html" title="class in org.geotools.display.canvas">DisplayObject</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>AbstractCanvas</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>Canvas</DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html" title="class in org.geotools.display.canvas">ReferencedCanvas</A></DD></DL><HR><DL><DT>public abstract class <B>AbstractCanvas</B><DT>extends <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html" title="class in org.geotools.display.canvas">DisplayObject</A><DT>implements Canvas</DL><P>Manages the display and user manipulation of <CODE>Graphic</CODE> instances. A newly constructed is initially empty. To make something appears, <CODE>Graphic</CODE>s must be added using the <A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#add(org.opengis.go.display.primitive.Graphic)"><CODE>add</CODE></A> method. The visual content depends of the subclass. The contents are usually symbols, features or images, but some implementations can also manage non-geographic elements like a map scale. <p> This base class and the more specialized <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html" title="class in org.geotools.display.canvas"><CODE>ReferencedCanvas</CODE></A> subclass do not assume a two-dimensional rendering. Those same base classes could be used for a 3D rendering engine as well. <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html" title="class in org.geotools.display.canvas"><CODE>ReferencedCanvas2D</CODE></A> is the first subclass targeting specifically 2D rendering. <p> In Geotools implementation, there is four coordinate reference systems involved in rendering. declares abstract methods for three of them, but the actual CRS management is performed in the <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html" title="class in org.geotools.display.canvas"><CODE>ReferencedCanvas</CODE></A> subclass. The CRS are enumerated below (arrows are transforms): <p align="center"> data CRS <img src="doc-files/right.png"> <A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#getObjectiveCRS()">objective CRS</A> <img src="doc-files/right.png"> <A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#getDisplayCRS()">display CRS</A> <img src="doc-files/right.png"> <A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#getDeviceCRS()">device CRS</A> </p><P><P><DL><DT><B>Since:</B></DT> <DD>2.3</DD><DT><B>Author:</B></DT> <DD>Martin Desruisseaux</DD><DT><B>Module:</B></DT><DD><CODE><B>ext/go</B></CODE> (<A HREF="http://maven.geotools.fr/repository/org/geotools/gt2-go/"><CODE>gt2-go.jar</CODE></A>) (<A HREF="http://maven.geotools.fr/reports/go/index.html">Maven report</A>) (<A HREF="http://svn.geotools.org/geotools/tags/2.3.2/ext/go/src/org/geotools/display/canvas/AbstractCanvas.java">SVN head</A>)</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/RenderingHints.Key.html" title="class or interface in java.awt">RenderingHints.Key</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#FINEST_RESOLUTION">FINEST_RESOLUTION</A></B></CODE><BR> The finest rendering resolution in unit of <A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#getDisplayCRS()">display CRS</A>. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected <A HREF="../../../../org/geotools/factory/Hints.html" title="class in org.geotools.factory">Hints</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#hints">hints</A></B></CODE><BR> A set of rendering hints.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/RenderingHints.Key.html" title="class or interface in java.awt">RenderingHints.Key</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#PREFETCH">PREFETCH</A></B></CODE><BR> <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Boolean.html#TRUE" title="class or interface in java.lang"><CODE>Boolean.TRUE</CODE></A> if the canvas is allowed to prefetch data before to paint graphics. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/RenderingHints.Key.html" title="class or interface in java.awt">RenderingHints.Key</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#REQUIRED_RESOLUTION">REQUIRED_RESOLUTION</A></B></CODE><BR> The required rendering resolution in unit of <A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#getDisplayCRS()">display CRS</A>. </TD></TR></TABLE> <A NAME="fields_inherited_from_class_DisplayObject"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html" title="class in org.geotools.display.canvas">DisplayObject</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#DISPLAY_BOUNDS_PROPERTY">DISPLAY_BOUNDS_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#DISPLAY_CRS_PROPERTY">DISPLAY_CRS_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#ENVELOPE_PROPERTY">ENVELOPE_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#GRAPHICS_PROPERTY">GRAPHICS_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#listeners">listeners</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#NAME_PROPERTY">NAME_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#OBJECTIVE_CRS_PROPERTY">OBJECTIVE_CRS_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#PARENT_PROPERTY">PARENT_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#SCALE_PROPERTY">SCALE_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#TITLE_PROPERTY">TITLE_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#VISIBLE_PROPERTY">VISIBLE_PROPERTY</A>, <A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#Z_ORDER_HINT_PROPERTY">Z_ORDER_HINT_PROPERTY</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected </CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#AbstractCanvas(org.opengis.go.display.DisplayFactory, org.geotools.factory.Hints)">AbstractCanvas</A></B>(DisplayFactory factory, <A HREF="../../../../org/geotools/factory/Hints.html" title="class in org.geotools.factory">Hints</A> hints)</CODE><BR> Creates an initially empty canvas.</TD></TR></TABLE>⌨️ 快捷键说明
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